Question 922 Rules of the Road

The correct answer is C) Vessels anchored or aground. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, vessels that are anchored or aground are not required to sound their fog signals every two minutes. This is because anchored or aground vessels are not underway and do not pose the same risk of collision as vessels that are moving. The other answer choices are incorrect because vessels not under command or restricted in their ability to maneuver (A), vessels underway or making way (B), and vessels under sail or under tow (D) are all required to sound their fog signals every two minutes when operating in conditions of restricted visibility.